Hi Folks! I welcome you on board. Thank you for clicking this read. Happy to see you around. In this post today, I’ll walk you through the Introduction to CA3140.
The CA3140 is a general-purpose op-amp that comes with a 4.5MHz frequency. It is a BiMOS Operational Amplifier incorporated with MOSFET Input/Bipolar Output that extends the advantages of both… high-voltage bipolar transistors and high-voltage PMOS transistors on a single integrated chip.
I suggest you read this post all the way through as I’ll detail the complete Introduction to CA3140 covering datasheet, pinout, features, and applications. Let’s jump right in.
Introduction to CA3140
- The CA3140 is a general-purpose op-amp that comes with MOSFET Input/Bipolar Output and extends the advantages of both… high-voltage bipolar transistors and high-voltage PMOS transistors on a single integrated chip.
- This device is used in comparators and active filters. Available with a 4.5MHz frequency, CA3140 is also employed in power supplies and tone controls.
- It is an ideal pick for function generators and standard amplifier applications.
- It is available in an 8-pin PDIP Package and comes with a voltage gain of 100dB.
- It carries a wide common-mode input voltage range and with supply voltage range from 4V to 36V.
- This device is almost similar to CA3240 where the main difference lies with the number of op-amps inside the package. The CA3240 is more compact and cost-effective and comes with two op-amps inside the package while CA3140 carries only one op-amp inside the package.
- The CA3140 incorporates two offset null pins (Pin# 1 and Pin# 5). These two pins are employed inside the package to adjust the offset error of this op-amp.
- When the voltage difference between non-inverting and inverting pins is zero then the corresponding output voltage must be zero. If it is not zero, it is termed as an offset error which can only be adjusted using these two offset pins.
CA3140 Datasheet
Before applying this tiny little beast to your electrical project, it’s better to go through the datasheet of this device that details the main characteristics of the device. You can download the datasheet of CA3140 by clicking the link below.
CA3140 Pinout
The following table shows the pin description of CA3140.
| Absolute Maximum Rating of CA3140 | ||||
|---|---|---|---|---|
| Pin No. | Description | Pin Name | ||
| 1,5 | Used to adjust offset error | Offset Null | ||
| 2 | Inverting pin of the op-amp | Inverting Input(IN -) | ||
| 3 | Non-inverting pin of op-amp | Non-inverting Input(IN +) | ||
| 4 | Ground | GND | ||
| 6 | Output Pin | Output | ||
| 7 | Voltage Supply | Vcc | ||
| 8 | This pin is employed for phase compensation or to turn off the output stage. | Strobe | ||
The following figure shows the pinout diagram of CA3140.
Two pins (pin# 1 and pin#5) are used to correct the offset error.
CA3140 Features and Characteristics
- Wide common mode input voltage range
- Available in 8-Pin PDIP Package
- Voltage Gain dB = 100 dB
- Low Input Current (Il) -10pA at ±15V
- Output Current per Channel = 40 mA
- Gain Bandwidth Product, GBP = 4.5 MHz
- Slew Rate, SR = 9 V/us
- Output swing complements input common mode range
- Common Mode Rejection Ratio – CMRR = 70 dB
- Supply Voltage = 4V to 36 V
- Operating Supply Current = 4 mA
- High Input Impedance (ZIN) = -1.5T?
CA3140 Applications
The following are some main applications of CA3140.
- Employed in the sample and hold amplifiers.
- Incorporated in photocurrent instrumentation and peak detectors.
- Used in long-duration timers/multivibrators (µseconds-Minutes-Hours).
- Employed in 5V TTL Systems and other low-supply voltage systems.
- Used in comparators and active filters.
- Used in tone controls and power supplies.
- Used in function generators and standard amplifier applications.
- Incorporated in portable instruments and intrusion alarm systems.
That was all about CA3140. Hope you find this article helpful. If you’re unsure or have any questions in your mind, you can pop your question in the section below, I’ll try to help you the best way I can. Feel free to share your valuable suggestions and feedback, and help us create content customized to your exact needs and requirements. Thank you for reading the article.
I have used the DIL CA3240 with success. Converting to SMD however I am finding an issue.
Cannot find the CA3240 in SOIC-8. All the other Rail-to-rail. JFET input. Single rail 30V. SOP8 are expensive and not on stock at JLCPCB!
I might have to used DIL CA3240 devices in the 2 positions they are needed anyway and hand fit them.
Cheers, M Reply